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Flutter / Dart - Ouvre une vue après un délai

J'essaie de trouver une solution pour ouvrir une vue après un retard dans une vue de chargement. J'ai une vue, dans laquelle il y a un bouton et quand j'appuie dessus, la méthode onPressed() déclenche une Navigator.of(Context).pushNamed("/loading"). qui ouvre la vue de chargement. Dans la vue de chargement, j'ai alors une fonction pour faire un retard de 1,5 sec et ensuite ouvrir la vue d'accueil, voici le code:

Future delay() async{
await new Future.delayed(new Duration(milliseconds: 1500), ()
{
   Navigator.of(context).pushNamed("/home");

}

Cependant, lorsque le délai démarre, après 1,5 seconde, il ouvre la vue Accueil, mais avec cette exception:

I/flutter ( 5226): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter ( 5226): The following assertion was thrown building IconTheme(color: Color(0xff000000)):
I/flutter ( 5226): Multiple widgets used the same GlobalKey.
I/flutter ( 5226): The key [LabeledGlobalKey<ScaffoldState>#a0051] was used by multiple widgets. The parents of those
I/flutter ( 5226): widgets were different widgets that both had the following description:
I/flutter ( 5226):   IconTheme(color: Color(0xff000000))
I/flutter ( 5226): A GlobalKey can only be specified on one widget at a time in the widget tree.
I/flutter ( 5226): When the exception was thrown, this was the stack:
I/flutter ( 5226): #0      GlobalKey._debugReserveFor.<anonymous closure> (package:flutter/src/widgets/framework.Dart:172:9)
I/flutter ( 5226): #1      GlobalKey._debugReserveFor (package:flutter/src/widgets/framework.Dart:182:6)
I/flutter ( 5226): #2      Element.updateChild.<anonymous closure> (package:flutter/src/widgets/framework.Dart:2649:13)
I/flutter ( 5226): #3      Element.updateChild (package:flutter/src/widgets/framework.Dart:2652:6)
I/flutter ( 5226): #4      ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #5      Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #6      ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #7      ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #8      Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #9      Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #10     ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #11     Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #12     ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #13     ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #14     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #15     Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #16     ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #17     Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #18     ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #19     ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #20     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #21     Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #22     ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #23     Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #24     ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #25     ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #26     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #27     Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #28     ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #29     Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #30     ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #31     ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #32     ParentDataElement.mount (package:flutter/src/widgets/framework.Dart:3893:16)
I/flutter ( 5226): #33     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #34     MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.Dart:4693:32)
I/flutter ( 5226): #35     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #36     Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #37     ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #38     Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #39     ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #40     ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #41     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #42     Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #43     ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #44     Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #45     ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #46     StatefulElement._firstBuild (package:flutter/src/widgets/framework.Dart:3718:22)
I/flutter ( 5226): #47     ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #48     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #49     Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #50     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.Dart:4588:14)
I/flutter ( 5226): #51     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #52     Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #53     ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #54     Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #55     ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #56     ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #57     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #58     Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #59     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.Dart:4588:14)
I/flutter ( 5226): #60     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #61     Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #62     ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #63     Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #64     ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #65     StatefulElement._firstBuild (package:flutter/src/widgets/framework.Dart:3718:22)
I/flutter ( 5226): #66     ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #67     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #68     Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #69     ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #70     Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #71     ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #72     StatefulElement._firstBuild (package:flutter/src/widgets/framework.Dart:3718:22)
I/flutter ( 5226): #73     ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #74     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #75     Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #76     ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #77     Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #78     ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #79     ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #80     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #81     Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #82     ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #83     Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #84     ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #85     ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #86     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #87     Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #88     ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #89     Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #90     ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #91     StatefulElement._firstBuild (package:flutter/src/widgets/framework.Dart:3718:22)
I/flutter ( 5226): #92     ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #93     Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #94     Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #95     ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #96     Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #97     ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #98     StatefulElement._firstBuild (package:flutter/src/widgets/framework.Dart:3718:22)
I/flutter ( 5226): #99     ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #100    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #101    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #102    ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #103    Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #104    ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #105    ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #106    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #107    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #108    ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #109    Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #110    ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #111    ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #112    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #113    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #114    SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.Dart:4588:14)
I/flutter ( 5226): #115    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #116    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #117    SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.Dart:4588:14)
I/flutter ( 5226): #118    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #119    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #120    SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.Dart:4588:14)
I/flutter ( 5226): #121    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #122    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #123    ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #124    Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #125    ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #126    StatefulElement._firstBuild (package:flutter/src/widgets/framework.Dart:3718:22)
I/flutter ( 5226): #127    ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #128    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #129    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #130    ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #131    Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #132    ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #133    ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #134    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #135    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #136    SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.Dart:4588:14)
I/flutter ( 5226): #137    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #138    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #139    SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.Dart:4588:14)
I/flutter ( 5226): #140    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #141    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #142    ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #143    Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #144    ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #145    ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
E/flutter ( 5226): [ERROR:topaz/lib/tonic/logging/Dart_error.cc(16)] Unhandled exception:
E/flutter ( 5226): NoSuchMethodError: The method 'ancestorStateOfType' was called on null.
E/flutter ( 5226): Receiver: null
E/flutter ( 5226): Tried calling: ancestorStateOfType(Instance of 'TypeMatcher<NavigatorState>')
E/flutter ( 5226): #0      Object.noSuchMethod (Dart:core-patch/Dart:core/object_patch.Dart:46)
E/flutter ( 5226): #1      Navigator.of (package:flutter/src/widgets/navigator.Dart:722:19)
E/flutter ( 5226): #2      Navigator.pushReplacementNamed (package:flutter/src/widgets/navigator.Dart:666:22)
E/flutter ( 5226): #3      switcher (package:ticketing/router.Dart:53:13)
E/flutter ( 5226): #4      _LoadingViewState.switchView (/data/user/0/com.tiziano.flutterapp.flutterapp2/cache/ticketing_remasteredAHSWSC/ticketing_remastered/lib/view/loadingview/LoadingView.Dart:79:3)
E/flutter ( 5226): #5      _LoadingViewState.delay.<anonymous closure> (/data/user/0/com.tiziano.flutterapp.flutterapp2/cache/ticketing_remasteredAHSWSC/ticketing_remastered/lib/view/loadingview/LoadingView.Dart:74:70)
E/flutter ( 5226): #6      new Future.delayed.<anonymous closure> (Dart:async/future.Dart:310)
E/flutter ( 5226): #7      Timer._createTimer.<anonymous closure> (Dart:async-patch/Dart:async/timer_patch.Dart:21)
E/flutter ( 5226): #8      _Timer._runTimers (Dart:isolate-patch/Dart:isolate/timer_impl.Dart:367)
E/flutter ( 5226): #9      _Timer._handleMessage (Dart:isolate-patch/Dart:isolate/timer_impl.Dart:401)
E/flutter ( 5226): #10     _RawReceivePortImpl._handleMessage (Dart:isolate-patch/Dart:isolate/isolate_patch.Dart:164)
I/flutter ( 5226): #146    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #147    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #148    SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.Dart:4588:14)
I/flutter ( 5226): #149    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #150    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #151    ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #152    Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #153    ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #154    StatefulElement._firstBuild (package:flutter/src/widgets/framework.Dart:3718:22)
I/flutter ( 5226): #155    ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #156    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #157    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #158    ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #159    Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #160    ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #161    StatefulElement._firstBuild (package:flutter/src/widgets/framework.Dart:3718:22)
I/flutter ( 5226): #162    ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #163    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #164    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #165    ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #166    Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #167    ComponentElement._firstBuild (package:flutter/src/widgets/framework.Dart:3582:5)
I/flutter ( 5226): #168    StatefulElement._firstBuild (package:flutter/src/widgets/framework.Dart:3718:22)
I/flutter ( 5226): #169    ComponentElement.mount (package:flutter/src/widgets/framework.Dart:3577:5)
I/flutter ( 5226): #170    Element.inflateWidget (package:flutter/src/widgets/framework.Dart:2875:14)
I/flutter ( 5226): #171    Element.updateChild (package:flutter/src/widgets/framework.Dart:2678:12)
I/flutter ( 5226): #172    RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.Dart:4375:32)
I/flutter ( 5226): #173    MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.Dart:4703:17)
I/flutter ( 5226): #174    Element.updateChild (package:flutter/src/widgets/framework.Dart:2667:15)
I/flutter ( 5226): #175    _TheatreElement.update (package:flutter/src/widgets/overlay.Dart:507:16)
I/flutter ( 5226): #176    Element.updateChild (package:flutter/src/widgets/framework.Dart:2667:15)
I/flutter ( 5226): #177    ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #178    Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #179    StatefulElement.update (package:flutter/src/widgets/framework.Dart:3737:5)
I/flutter ( 5226): #180    Element.updateChild (package:flutter/src/widgets/framework.Dart:2667:15)
I/flutter ( 5226): #181    ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #182    Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #183    ProxyElement.update (package:flutter/src/widgets/framework.Dart:3847:5)
I/flutter ( 5226): #184    Element.updateChild (package:flutter/src/widgets/framework.Dart:2667:15)
I/flutter ( 5226): #185    SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.Dart:4595:14)
I/flutter ( 5226): #186    Element.updateChild (package:flutter/src/widgets/framework.Dart:2667:15)
I/flutter ( 5226): #187    ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #188    Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #189    StatefulElement.update (package:flutter/src/widgets/framework.Dart:3737:5)
I/flutter ( 5226): #190    Element.updateChild (package:flutter/src/widgets/framework.Dart:2667:15)
I/flutter ( 5226): #191    SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.Dart:4595:14)
I/flutter ( 5226): #192    Element.updateChild (package:flutter/src/widgets/framework.Dart:2667:15)
I/flutter ( 5226): #193    SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.Dart:4595:14)
I/flutter ( 5226): #194    Element.updateChild (package:flutter/src/widgets/framework.Dart:2667:15)
I/flutter ( 5226): #195    ComponentElement.performRebuild (package:flutter/src/widgets/framework.Dart:3613:16)
I/flutter ( 5226): #196    Element.rebuild (package:flutter/src/widgets/framework.Dart:3463:5)
I/flutter ( 5226): #197    BuildOwner.buildScope (package:flutter/src/widgets/framework.Dart:2210:33)
I/flutter ( 5226): #198    BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.Dart:621:20)
I/flutter ( 5226): #199    BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.Dart:208:5)
I/flutter ( 5226): #200    BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.Dart:990:15)
I/flutter ( 5226): #201    BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.Dart:930:9)
I/flutter ( 5226): #202    BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.Dart:842:5)
I/flutter ( 5226): #203    _invoke (file:///b/build/slave/Linux_Engine/build/src/flutter/lib/ui/hooks.Dart:120)
I/flutter ( 5226): #204    _drawFrame (file:///b/build/slave/Linux_Engine/build/src/flutter/lib/ui/hooks.Dart:109)
I/flutter ( 5226): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter ( 5226): Another exception was thrown: Multiple widgets used the same GlobalKey.

Soit dit en passant, dans la vue d'accueil, il n'y a pas d'icône noire. (IconTheme (couleur: Couleur (0xff000000)) Quelqu'un peut-il aider?

viewdartflutter
11
Tiziano Gioè

Pour ouvrir une vue après un certain délai, vous pouvez utiliser Future.delayed :

Future.delayed(const Duration(milliseconds: 500), () {
  setState(() {
    // Here you can write your code for open new view
  });
});

J'espère que cela vous aidera.

12
Rahul Sharma

Utilisation Future.delay constructeur de Dart:async bibliothèque, le code suivant navigue de la première page à la deuxième page après 3 secondes de clic sur RaisedButton, je ne comprends pas pourquoi vous poussez une vue chargement?

import 'Dart:async';

class FirstView extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new Center(
        child: new Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            new Text("FIRST VIEW"),
            new RaisedButton(
              onPressed: () async {
                await new Future.delayed(const Duration(seconds: 3));
                Navigator.Push(context, new MaterialPageRoute(builder: (__) => new SecondView()));
              },
              child: new Text("Go to 2nd view"),
            )
          ],
        ),
      ),
    );
  }
}

class SecondView extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new Center(
        child: new Text("SECOND VIEW"),
      ),
    );
  }
}
10
aziza

Peut-être une utilisation multiple d'une seule clé dans deux widgets?

Difficile d'en dire plus sans le code.

Référence clé - https://docs.flutter.io/flutter/widgets/Widget/key.html

0
Vilokan Labs